What may be the next big thing will be instrument specific Collections. For example
An imagined V7: The Organ Collection
Upgrades to the existing organs; addition of Vox Baroque, Jaguar and original Continental and Continental II
Upgrade to the Farfisa; Addition of Combo compact, Mini Compact and Compact Duo
Andy upgrades to the B-3 that may be desired
Addition of the Farfisa Professionals
Panther Duo Delxue
Yamaha 45D
Doric 61TT or 61TTMix
Ace Tone Top 5
Electronic Theatre Organ; probably the big Lowery but I like the Schober from the '60's and '70's
V 8 Full set of String machines
Any upgrades to the Solina IV Arturuia wishes to make
Any upgrades to the Solina IV that you wish
Elka Rhapsody line
Multivox
Crumar
ARP Omni I & II
Freeman multi-Oscillator Symphonizer
One thing that would be nice would be to enable a 3rd rank of strings
V9 Multi-Channel Keys
ARP Quadra
Siel/Arp Quartet
Korg Trilogy
Sequntial Circuits Prelude
Yamoa SK-15, 20, 30
Crumar Orchestrator/Multiman
Moog Opus 3; The one fault that I find with it was that it was the lower 4 octaves rather than the upper. Also some upgrades from paraphonic to full polyphonic, all 3 saw octaves available for Strings and Brass and on the organ; the odd harmonics available, the "Tone" replaceable by a 3 state resonant filter, sine/square/both waveforms
Roland Saturn 09
V10 Electronic Pianos
RMI Piano
Any upgrades or additions to the Wurly and Fender that you wish
Hohner Pianet
Baldwin Electric Harpsichord
RMI Rock-si-chord
Univox
Crumar
Most of the electronic pianos, qua piano, were tres abominable, but they all sounded good or cool, in a kitschy way, for other things and
V12 Moog
Any desired upgrades to the Modular and Mini
Memorymoog
Liberator
Rogue
Prodigy
Multi
Polymoog Synnth & Keyboard
V 13 Arturia original
Brute
SFZ/SF2
Original instruments in each category: organ; combo and console, Multichannel, String, eletronic piano
I've shown some of my designs for organs and multichannels elsewhere